<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <!--添加角色按钮区域-->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>  
            </el-row>

            <!--角色列表区域-->
            <el-table :data="rolelist" border stripe>
                <!--展开列-->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!--渲染一级权限-->
                          <el-col :span="5">
                              <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                              <i class="el-icon-caret-right"></i>
                          </el-col>
                          <!--渲染二级和三级权限-->
                          <el-col :span="19">
                              <!--通过for循环嵌套渲染二级权限-->
                              <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                  <el-col :span="6">
                                      <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                      <i class="el-icon-caret-right"></i>
                                  </el-col>
                                  <el-col :span="18">
                                      <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                  </el-col>
                              </el-row>
                          </el-col>
                        </el-row>
                        <!-- <pre>
                            {{scope.row}}
                        </pre> -->
                    </template>
                </el-table-column>
                <!--索引列-->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog
                        (scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>  
        </el-card>

        <!--分配权限的对话框-->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close="setRightDialogClosed">
            <!--树形控件-->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
        </el-dialog>
   </div>
</template>

<script>
export default {
  data(){
      return {
          //所有角色列表数据
          rolelist:[],
          //控制分配权限对话框的显示与隐藏
          setRightDialogVisible: false,
          //所有权限的数据
          rightslist:[],
          //树形控件的绑定对象
          treeProps:{
              label:'authName',
              children:'children'
          },
          //默认选中的节点ID值数组
          defKeys:[],
          //当前即将分配权限的角色id
          roleId: ''
      }
  },
  created(){
      this.getRolesList()
  },
  methods:{
      //获取所有角色的列表
      async getRolesList(){
         const {data: res} = await this.$http.get('roles')
         if(res.meta.status !== 200){
             return this.$message.error('获取角色列表失败!')
         }
         this.rolelist = res.data
         console.log(this.rolelist)
      },
      //根据Id删除对应的权限
      async removeRightById(role,rightId){
          //弹框提示用户是否要删除
          const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm'){
            return this.$message.info('取消了删除!')
        }
        const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status !== 200){
            return this.$message.error('删除权限失败!')
        }
        /* this.getRolesList() */
        role.children = res.data
      },
      //展示分配权限的对话框
      async showSetRightDialog(role){
          this.roleId = role.id
          //获取所有权限的数据
          const {data:res} = await this.$http.get('rights/tree')
          if(res.meta.status !==200){
              return this.$message.error('获取权限数据失败!')
          }
          //把获取到的权限数据保存到data中
          this.rightslist = res.data
          console.log(this.rightslist)
          //递归获取二级节点的Id
          this.getLeafKeys(role,
          this.defKeys)

          this.setRightDialogVisible = true
      },
      //通过递口的形式，获取角色下所有三级权限的id，并保存到 defkeys 数组中
      getLeafKeys(node, arr){
          if(!node.children){
              //如果当前node节点不包含children属性，则是三级节点
              return arr.push(node.id)
          }
          node.children.forEach(item =>
          this.getLeafKeys(item,arr))
      },
      //监听分配权限对话框的关闭事件
      setRightDialogClosed(){
          this.defKeys = []
      },
      //点击为角色分配权限
      async allotRights(){
          const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
          ]
          const idStr = keys.join(',')
          const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
          if(res.meta.status !== 200){
              return this.$message.error('分配权限失败!')
          }
          this.$message.success('分配权限成功!')
          this.getRolesList()
          this.setRightDialogVisible = false
      }  
  }
}
</script>

<style lang="less" scoped>
    .el-tag{
        margin: 7px;
    }

    .bdtop{
        border-top: 1px solid #eee;
    }

    .bdbottom{
        border-bottom: 1px solid #eee;
    }

    .vcenter{
        display: flex;
        align-items: center;
    }


</style>